line.c

 
#include <freerdp/config.h>
 
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
 
#include <winpr/assert.h>
 
#include <freerdp/freerdp.h>
#include <freerdp/gdi/gdi.h>
#include <freerdp/gdi/pen.h>
#include <freerdp/gdi/bitmap.h>
#include <freerdp/gdi/region.h>
 
#include "drawing.h"
#include "clipping.h"
#include "line.h"
 
static BOOL gdi_rop_color(UINT32 rop, BYTE* pixelPtr, UINT32 pen, UINT32 format)
{
  WINPR_ASSERT(pixelPtr);
  const UINT32 srcPixel = FreeRDPReadColor(pixelPtr, format);
  UINT32 dstPixel = 0;
 
  switch (rop)
  {
    case GDI_R2_BLACK: /* LineTo_BLACK */
      dstPixel = FreeRDPGetColor(format, 0, 0, 0, 0xFF);
      break;
 
    case GDI_R2_NOTMERGEPEN: /* LineTo_NOTMERGEPEN */
      dstPixel = ~(srcPixel | pen);
      break;
 
    case GDI_R2_MASKNOTPEN: /* LineTo_MASKNOTPEN */
      dstPixel = srcPixel & ~pen;
      break;
 
    case GDI_R2_NOTCOPYPEN: /* LineTo_NOTCOPYPEN */
      dstPixel = ~pen;
      break;
 
    case GDI_R2_MASKPENNOT: /* LineTo_MASKPENNOT */
      dstPixel = pen & ~srcPixel;
      break;
 
    case GDI_R2_NOT: /* LineTo_NOT */
      dstPixel = ~srcPixel;
      break;
 
    case GDI_R2_XORPEN: /* LineTo_XORPEN */
      dstPixel = srcPixel ^ pen;
      break;
 
    case GDI_R2_NOTMASKPEN: /* LineTo_NOTMASKPEN */
      dstPixel = ~(srcPixel & pen);
      break;
 
    case GDI_R2_MASKPEN: /* LineTo_MASKPEN */
      dstPixel = srcPixel & pen;
      break;
 
    case GDI_R2_NOTXORPEN: /* LineTo_NOTXORPEN */
      dstPixel = ~(srcPixel ^ pen);
      break;
 
    case GDI_R2_NOP: /* LineTo_NOP */
      dstPixel = srcPixel;
      break;
 
    case GDI_R2_MERGENOTPEN: /* LineTo_MERGENOTPEN */
      dstPixel = srcPixel | ~pen;
      break;
 
    case GDI_R2_COPYPEN: /* LineTo_COPYPEN */
      dstPixel = pen;
      break;
 
    case GDI_R2_MERGEPENNOT: /* LineTo_MERGEPENNOT */
      dstPixel = srcPixel | ~pen;
      break;
 
    case GDI_R2_MERGEPEN: /* LineTo_MERGEPEN */
      dstPixel = srcPixel | pen;
      break;
 
    case GDI_R2_WHITE: /* LineTo_WHITE */
      dstPixel = FreeRDPGetColor(format, 0xFF, 0xFF, 0xFF, 0xFF);
      break;
 
    default:
      return FALSE;
  }
 
  return FreeRDPWriteColor(pixelPtr, format, dstPixel);
}
 
BOOL gdi_LineTo(HGDI_DC hdc, UINT32 nXEnd, UINT32 nYEnd)
{
  INT32 e2 = 0;
  UINT32 pen = 0;
 
  WINPR_ASSERT(hdc);
  const INT32 rop2 = gdi_GetROP2(hdc);
 
  const INT32 x1 = hdc->pen->posX;
  const INT32 y1 = hdc->pen->posY;
  const INT32 x2 = nXEnd;
  const INT32 y2 = nYEnd;
  const INT32 dx = (x1 > x2) ? x1 - x2 : x2 - x1;
  const INT32 dy = (y1 > y2) ? y1 - y2 : y2 - y1;
  const INT32 sx = (x1 < x2) ? 1 : -1;
  const INT32 sy = (y1 < y2) ? 1 : -1;
  INT32 e = dx - dy;
  INT32 x = x1;
  INT32 y = y1;
 
  WINPR_ASSERT(hdc->clip);
  INT32 bx1 = 0;
  INT32 by1 = 0;
  INT32 bx2 = 0;
  INT32 by2 = 0;
  if (hdc->clip->null)
  {
    bx1 = (x1 < x2) ? x1 : x2;
    by1 = (y1 < y2) ? y1 : y2;
    bx2 = (x1 > x2) ? x1 : x2;
    by2 = (y1 > y2) ? y1 : y2;
  }
  else
  {
    bx1 = hdc->clip->x;
    by1 = hdc->clip->y;
    bx2 = bx1 + hdc->clip->w - 1;
    by2 = by1 + hdc->clip->h - 1;
  }
 
  HGDI_BITMAP bmp = (HGDI_BITMAP)hdc->selectedObject;
  WINPR_ASSERT(bmp);
 
  bx1 = MAX(bx1, 0);
  by1 = MAX(by1, 0);
  bx2 = MIN(bx2, bmp->width - 1);
  by2 = MIN(by2, bmp->height - 1);
 
  if (!gdi_InvalidateRegion(hdc, bx1, by1, bx2 - bx1 + 1, by2 - by1 + 1))
    return FALSE;
 
  pen = gdi_GetPenColor(hdc->pen, bmp->format);
 
  while (1)
  {
    if (!(x == x2 && y == y2))
    {
      if ((x >= bx1 && x <= bx2) && (y >= by1 && y <= by2))
      {
        BYTE* pixel = gdi_GetPointer(bmp, x, y);
        WINPR_ASSERT(pixel);
        gdi_rop_color(rop2, pixel, pen, bmp->format);
      }
    }
    else
    {
      break;
    }
 
    e2 = 2 * e;
 
    if (e2 > -dy)
    {
      e -= dy;
      x += sx;
    }
 
    if (e2 < dx)
    {
      e += dx;
      y += sy;
    }
  }
 
  return TRUE;
}
 
BOOL gdi_PolylineTo(HGDI_DC hdc, GDI_POINT* lppt, DWORD cCount)
{
  WINPR_ASSERT(hdc);
  WINPR_ASSERT(lppt || (cCount == 0));
 
  for (DWORD i = 0; i < cCount; i++)
  {
    if (!gdi_LineTo(hdc, lppt[i].x, lppt[i].y))
      return FALSE;
 
    if (!gdi_MoveToEx(hdc, lppt[i].x, lppt[i].y, NULL))
      return FALSE;
  }
 
  return TRUE;
}
 
BOOL gdi_Polyline(HGDI_DC hdc, GDI_POINT* lppt, UINT32 cPoints)
{
  WINPR_ASSERT(hdc);
  WINPR_ASSERT(lppt || (cPoints == 0));
 
  if (cPoints > 0)
  {
    GDI_POINT pt = { 0 };
 
    if (!gdi_MoveToEx(hdc, lppt[0].x, lppt[0].y, &pt))
      return FALSE;
 
    for (UINT32 i = 0; i < cPoints; i++)
    {
      if (!gdi_LineTo(hdc, lppt[i].x, lppt[i].y))
        return FALSE;
 
      if (!gdi_MoveToEx(hdc, lppt[i].x, lppt[i].y, NULL))
        return FALSE;
    }
 
    if (!gdi_MoveToEx(hdc, pt.x, pt.y, NULL))
      return FALSE;
  }
 
  return TRUE;
}
 
BOOL gdi_PolyPolyline(HGDI_DC hdc, GDI_POINT* lppt, const UINT32* lpdwPolyPoints, DWORD cCount)
{
  DWORD j = 0;
 
  WINPR_ASSERT(hdc);
  WINPR_ASSERT(lppt || (cCount == 0));
  WINPR_ASSERT(lpdwPolyPoints || (cCount == 0));
 
  for (DWORD i = 0; i < cCount; i++)
  {
    const UINT32 cPoints = lpdwPolyPoints[i];
 
    if (!gdi_Polyline(hdc, &lppt[j], cPoints))
      return FALSE;
 
    j += cPoints;
  }
 
  return TRUE;
}
 
BOOL gdi_MoveToEx(HGDI_DC hdc, UINT32 X, UINT32 Y, HGDI_POINT lpPoint)
{
  WINPR_ASSERT(hdc);
 
  if (lpPoint != NULL)
  {
    lpPoint->x = hdc->pen->posX;
    lpPoint->y = hdc->pen->posY;
  }
 
  hdc->pen->posX = X;
  hdc->pen->posY = Y;
  return TRUE;
}